TCA9802 Datasheet, PDF (10/36 Pages) Texas Instruments – Level-Translating I2C Bus Buffer/Repeater

TCA9802
SCPS266 – MARCH 2017
9 Detailed Description
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9.1 Overview
The TCA9802 is a dual-channel bidirectional buffer intended for I²C bus and SMBus/PMBus systems. It provides
bidirectional level shifting (up-translation and down-translation) between low voltages (down to 0.8 V) and higher
voltages (1.65 V to 3.6 V). The TCA9802 features an internal current source on the B-side of the device, allowing
the removal of external pull-up resistors on the B-side. The current source also provides an improved rise time
and ultra-low power consumption.
The TCA9802 is able to provide true buffering (rather than a pass-FET solution) without using a static voltage
offset or incremental offset. This means that the V_OL on both the A and B sides of the TCA9802 are very low
(approximately 0.2 V), helping to eliminate communication issues as a result of fixed V_IL thresholds. Another key
feature of the TCA9802 is that there are no power sequencing requirements, or power supply dependencies.
V_CCA can be greater than, less than, or equal to V_CCB. This gives the system designer flexibility with how the
TCA9802 is used.
The TCA9802 is part of a four device family with varying current source strengths (see the Device Comparison
Table).
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